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It is shown that the as-grown solid solutions Tl2xRb2(1-x)Cd2(SO4)3 possess aresidual optical birefringence in the cubic phase at room temperature. Theexistence of both the residual birefringence and the residual domain structurein the compound with x=0.8 at the room temperature, along with the domain wallsorientation and the orientation of extinction positions of the neighbouringdomains, indicate that the above domain structure corresponds to "forbidden"ferroelastic domains of the phase P212121. On the basis of measurements for thetemperature variation of the birefringence and observations of the domainstructure transformations, one can conclude that the phases with the symmetriesP213 and P21 coexist above Tc1 in the compounds with x = 0.7 - 1.0. The phasetransition temperatures Tc1, Tc2, and Tc3 obtained from the temperaturebirefringence variations agree well with those obtained previously, using thestudies of thermal expansion and ultrasonic wave velocities.

Optical Birefringence and Domain Structure of the as-grown Rb2xTl2(1-x)Cd2(SO4)3 Solid Solutions at Phase Transitions